File old_nettle_compat.patch of Package squid.31747

Author: Adam Majer <amajer@suse.de>
Date: Thu Jul 18 13:57:22 CEST 2019

nettle from SLE-12 is missing the change from later
versions that ignores the destLen parameter size to
base64_decode_update function. This is only used in
the assert() but we need to pass real size of the buffer
as otherwise all we get is a crash.

The missing commit in nettle is,
commit 07cb0b62a5fab216ed647f5a87e0f17ab3c9a615
Author: Niels Möller <nisse@lysator.liu.se>
Date:   Fri Feb 7 09:11:20 2014 +0100

    Base64 and base16 decoding: Use *dst_length as output only.


Index: squid-3.5.21/helpers/negotiate_auth/kerberos/negotiate_kerberos_auth.cc
===================================================================
--- squid-3.5.21.orig/helpers/negotiate_auth/kerberos/negotiate_kerberos_auth.cc
+++ squid-3.5.21/helpers/negotiate_auth/kerberos/negotiate_kerberos_auth.cc
@@ -667,7 +667,7 @@ main(int argc, char *const argv[])
 
         struct base64_decode_ctx ctx;
         base64_decode_init(&ctx);
-        unsigned int dstLen = 0;
+        unsigned int dstLen = input_token.length;
         if (!base64_decode_update(&ctx, &dstLen, static_cast<uint8_t*>(input_token.value), srcLen, b64Token) ||
                 !base64_decode_final(&ctx)) {
             debug((char *) "%s| %s: ERROR: Invalid base64 token [%s]\n", LogTime(), PROGRAM, b64Token);
Index: squid-3.5.21/helpers/negotiate_auth/wrapper/negotiate_wrapper.cc
===================================================================
--- squid-3.5.21.orig/helpers/negotiate_auth/wrapper/negotiate_wrapper.cc
+++ squid-3.5.21/helpers/negotiate_auth/wrapper/negotiate_wrapper.cc
@@ -341,7 +341,7 @@ main(int argc, char *const argv[])
 
         struct base64_decode_ctx ctx;
         base64_decode_init(&ctx);
-        unsigned int dstLen = 0;
+        unsigned int dstLen = length;
         if (!base64_decode_update(&ctx, &dstLen, token, strlen(buf+3), reinterpret_cast<const uint8_t*>(buf+3)) ||
                 !base64_decode_final(&ctx)) {
             if (debug)
Index: squid-3.5.21/helpers/ntlm_auth/fake/ntlm_fake_auth.cc
===================================================================
--- squid-3.5.21.orig/helpers/ntlm_auth/fake/ntlm_fake_auth.cc
+++ squid-3.5.21/helpers/ntlm_auth/fake/ntlm_fake_auth.cc
@@ -151,7 +151,7 @@ main(int argc, char *argv[])
         buflen = strlen(buf);   /* keep this so we only scan the buffer for \0 once per loop */
         struct base64_decode_ctx ctx;
         base64_decode_init(&ctx);
-        unsigned int dstLen = 0;
+        unsigned int dstLen = HELPER_INPUT_BUFFER;
         if (buflen > 3 &&
                 base64_decode_update(&ctx, &dstLen, decodedBuf, buflen-3, reinterpret_cast<const uint8_t*>(buf+3)) &&
                 base64_decode_final(&ctx)) {
Index: squid-3.5.21/helpers/ntlm_auth/smb_lm/ntlm_smb_lm_auth.cc
===================================================================
--- squid-3.5.21.orig/helpers/ntlm_auth/smb_lm/ntlm_smb_lm_auth.cc
+++ squid-3.5.21/helpers/ntlm_auth/smb_lm/ntlm_smb_lm_auth.cc
@@ -517,7 +517,7 @@ manage_request()
         /* figure out what we got */
         struct base64_decode_ctx ctx;
         base64_decode_init(&ctx);
-        unsigned int dstLen = 0;
+        unsigned int dstLen = NTLM_BLOB_BUFFER_SIZE;
         int decodedLen = 0;
         if (!base64_decode_update(&ctx, &dstLen, reinterpret_cast<uint8_t*>(decoded), strlen(buf)-3, reinterpret_cast<const uint8_t*>(buf+3)) ||
                 !base64_decode_final(&ctx)) {
Index: squid-3.5.21/src/HttpHeader.cc
===================================================================
--- squid-3.5.21.orig/src/HttpHeader.cc
+++ squid-3.5.21/src/HttpHeader.cc
@@ -1535,7 +1535,7 @@ HttpHeader::getAuth(http_hdr_type id, co
     static char decodedAuthToken[8192];
     struct base64_decode_ctx ctx;
     base64_decode_init(&ctx);
-    unsigned int decodedLen = 0;
+    unsigned int decodedLen = 8190;
     if (!base64_decode_update(&ctx, &decodedLen, reinterpret_cast<uint8_t*>(decodedAuthToken), strlen(field), reinterpret_cast<const uint8_t*>(field)) ||
             !base64_decode_final(&ctx)) {
         return NULL;
Index: squid-3.5.21/src/auth/basic/Config.cc
===================================================================
--- squid-3.5.21.orig/src/auth/basic/Config.cc
+++ squid-3.5.21/src/auth/basic/Config.cc
@@ -173,7 +173,7 @@ Auth::Basic::Config::decodeCleartext(con
     struct base64_decode_ctx ctx;
     base64_decode_init(&ctx);
 
-    unsigned int dstLen = 0;
+    unsigned int dstLen = BASE64_DECODE_LENGTH(srcLen)+1;
     if (base64_decode_update(&ctx, &dstLen, reinterpret_cast<uint8_t*>(cleartext), srcLen, (const uint8_t*)eek) && base64_decode_final(&ctx)) {
         cleartext[dstLen] = '\0';